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Segment Information (Geographical) (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenues, Total | $ 6,524 | $ 6,226
Noncurrent Assets | 18,712 | 16,995
CA |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenues, Total | 1,520 | 1,464
Noncurrent Assets | 4,128 | 3,995
UNITED STATES |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenues, Total | 4,537 | 4,328
Noncurrent Assets | 13,739 | 12,257
BARBADOS |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenues, Total | 319 | 280
Noncurrent Assets | 446 | 408
BAHAMAS |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenues, Total | 121 | 119
Noncurrent Assets | 315 | 276
DOMINICA |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Revenues, Total | 27 | 35
Noncurrent Assets | $ 84 | $ 59

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